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Message-ID: <1305149155.3232.11.camel@edumazet-laptop>
Date: Wed, 11 May 2011 23:25:55 +0200
From: Eric Dumazet <eric.dumazet@...il.com>
To: Dmitry Torokhov <dtor@...l.ru>
Cc: linux-input@...r.kernel.org,
linux-kernel <linux-kernel@...r.kernel.org>,
"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: [PATCH] input: remove useless synchronize_rcu() calls
There is no need to call synchronize_rcu() after a list insertion,
or a NULL->ptr assignment.
However, the reverse operations do need this call.
Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
CC: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>,
---
drivers/input/evdev.c | 2 --
drivers/input/input.c | 1 -
drivers/input/joydev.c | 1 -
drivers/input/mousedev.c | 1 -
4 files changed, 5 deletions(-)
diff --git a/drivers/input/evdev.c b/drivers/input/evdev.c
index 88d8e4c..c00e751 100644
--- a/drivers/input/evdev.c
+++ b/drivers/input/evdev.c
@@ -159,7 +159,6 @@ static int evdev_grab(struct evdev *evdev, struct evdev_client *client)
return error;
rcu_assign_pointer(evdev->grab, client);
- synchronize_rcu();
return 0;
}
@@ -182,7 +181,6 @@ static void evdev_attach_client(struct evdev *evdev,
spin_lock(&evdev->client_lock);
list_add_tail_rcu(&client->node, &evdev->client_list);
spin_unlock(&evdev->client_lock);
- synchronize_rcu();
}
static void evdev_detach_client(struct evdev *evdev,
diff --git a/drivers/input/input.c b/drivers/input/input.c
index ebbceed..75e11c7 100644
--- a/drivers/input/input.c
+++ b/drivers/input/input.c
@@ -451,7 +451,6 @@ int input_grab_device(struct input_handle *handle)
}
rcu_assign_pointer(dev->grab, handle);
- synchronize_rcu();
out:
mutex_unlock(&dev->mutex);
diff --git a/drivers/input/joydev.c b/drivers/input/joydev.c
index 5688b5c..c24ec2d 100644
--- a/drivers/input/joydev.c
+++ b/drivers/input/joydev.c
@@ -180,7 +180,6 @@ static void joydev_attach_client(struct joydev *joydev,
spin_lock(&joydev->client_lock);
list_add_tail_rcu(&client->node, &joydev->client_list);
spin_unlock(&joydev->client_lock);
- synchronize_rcu();
}
static void joydev_detach_client(struct joydev *joydev,
diff --git a/drivers/input/mousedev.c b/drivers/input/mousedev.c
index 7630273..257e033 100644
--- a/drivers/input/mousedev.c
+++ b/drivers/input/mousedev.c
@@ -508,7 +508,6 @@ static void mousedev_attach_client(struct mousedev *mousedev,
spin_lock(&mousedev->client_lock);
list_add_tail_rcu(&client->node, &mousedev->client_list);
spin_unlock(&mousedev->client_lock);
- synchronize_rcu();
}
static void mousedev_detach_client(struct mousedev *mousedev,
--
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